IVERMECTIN kills 35 stages of worms and bots combined in a single dose, providing the broadest spectrum parasite control available. Ivermectin wormer paste controls bots, large strongyles, small bloodworm's, ascarids (roundworms), bots, thread worms, pin worms, hair worms, lung worms and large mouth stomach worms. Proven safe for pregnant mares, breeding stallions, and any age foal.